Fix babel-plugin-jest-hoist (#1754)

* Move toMatchSnapshot to jest-matchers package

* Remove jasmine dependency from jest-snapshot

* Fixes for babel-plugin-jest-hoist.

integration_tests/__tests__/babel-plugin-jest-hoist-test.js

@@ -27,7 +27,7 @@ if (process.platform !== 'win32') {
 }
 
 it('sucessfully runs the tests inside `babel-plugin-jest-hoist/`', () => {
-  const {json} = runJest.json(DIR, ['--no-cache']);
+  const {json} = runJest.json(DIR, ['--no-cache', '--coverage']);
   expect(json.success).toBe(true);
   expect(json.numTotalTestSuites).toBe(2);
 });

integration_tests/babel-plugin-jest-hoist/__tests__/integration-test.js

@@ -23,7 +23,7 @@ import e from '../__test_modules__/e';
 
 // These will all be hoisted above imports
 jest.unmock('react');
-jest.unmock('../__test_modules__/Unmocked');
+jest.deepUnmock('../__test_modules__/Unmocked');
 jest
   .unmock('../__test_modules__/c')
   .unmock('../__test_modules__/d');
@@ -111,4 +111,10 @@ describe('babel-plugin-jest-hoist', () => {
     expect(b._isMockFunction).toBe(true);
     expect(b()).toEqual(undefined);
   });
+
+  it('requires modules that also call jest.mock', () => {
+    require('../mock-file');
+    const mock = require('../banana');
+    expect(mock).toEqual('apple');
+  });
 });

integration_tests/babel-plugin-jest-hoist/banana.js

@@ -0,0 +1,9 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+ module.exports = 'banana';

integration_tests/babel-plugin-jest-hoist/mock-file.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+jest.mock('./banana', () => {
+  const exports = 'apple';
+  return exports;
+});

packages/babel-plugin-jest-hoist/src/index.js

@@ -106,7 +106,9 @@ FUNCTIONS.mock = args => {
       if (!found) {
         invariant(
           (scope.hasGlobal(name) && WHITELISTED_IDENTIFIERS[name]) ||
-          /^mock/.test(name),
+          /^mock/.test(name) ||
+          // Allow istanbul's coverage variable to pass.
+          //^(?:__)?cov/.test(name),
           'The module factory of `jest.mock()` is not allowed to ' +
           'reference any out-of-scope variables.\n' +
           'Invalid variable access: ' + name + '\n' +
@@ -125,6 +127,7 @@ FUNCTIONS.mock = args => {
 };
 
 FUNCTIONS.unmock = args => args.length === 1 && args[0].isStringLiteral();
+FUNCTIONS.deepUnmock = args => args.length === 1 && args[0].isStringLiteral();
 
 FUNCTIONS.disableAutomock =
   FUNCTIONS.enableAutomock =